I'm guessing that's more so "market value" of the industry as a whole and not net profit. Lots of companies like to throw around their industry total worth. There are a lot of us bitches making lots of money. After they take out the expenses, like payout for models and affiliates, server costs, site upkeep, employee expenses, lawyers, online security, lobbyists, payment processor fees, and probably a lot more I'm not thinking, it's a lot less that isn't a number worth bragging compared to the money coming in.
Camming is very lucrative industry, but it takes a lot to run a site and keep it afloat. Sites come and go all the time because they can't failed to see how much of an expense it is to run a site, and they can't pay their models on time or they need to shut down.